Danfoss Run & Start Capacitors

Danfoss Run & Start Capacitors: OEM-Grade Motor Starting Precision

When a compressor fails to start or struggles to maintain speed, a worn or failed capacitor is often the culprit. Danfoss — a globally recognized leader in climate and refrigeration solutions — engineers its run and start capacitors as genuine OEM electrical components, purpose-built to match the exacting electrical demands of Danfoss compressor platforms.

What Sets Danfoss Capacitors Apart

Danfoss capacitors are not generic off-the-shelf components. They are designed from the ground up as integral accessories for Danfoss compressor families, meaning the capacitance values, voltage ratings, and physical form factors are precisely matched to specific compressor models rather than approximated for broad compatibility.

• OEM Specifications: Built to original equipment manufacturer (OEM) specifications, Danfoss capacitors maintain strict capacitance tolerances and high insulation resistance to prevent premature failure during frequent cycling.
• Start Capacitors: Danfoss start capacitors are designed to provide an initial jolt of energy to start up single-phase motors — such as those found in air conditioning compressors and refrigeration units — temporarily increasing the motor's starting torque and electrical power upon activation.
• Run Capacitors: Danfoss run capacitors, such as the 117-7114 (23.5 microfarads, 250V), provide reliable performance for HVAC and refrigeration motors, with factory-installed leads for easy connection to ensure smooth motor operation.
• CSR Kits: The Danfoss CSR (Capacitor Start – Capacitor Run) starting kit is a genuine multi-capacitor solution designed for single-phase hermetic reciprocating compressors, providing reliable starting torque and running performance.

Compressor Model Compatibility

Danfoss capacitors span a wide range of voltage and capacitance ratings to cover their extensive compressor lineup. The Danfoss 117U5017 Start Capacitor, for example, is a critical electrical component designed specifically for SC model compressors, providing the necessary torque for reliable compressor startup in high-back-pressure and commercial refrigeration applications — rated at 80 microfarads and 220V to ensure the motor can overcome initial inertia and high head pressures without overheating the windings. On the run capacitor side, options such as the 20µF/450V run capacitor and the 50µF/440V run capacitor cover a broad spectrum of single-phase motor requirements.

The 117U5017, for instance, is the standard choice for Danfoss SC10, SC12, and SC15 Series compressors using 220–240V 50/60Hz power supplies. Whether you are servicing a light commercial refrigeration unit or a larger commercial cooling system, matching the correct Danfoss capacitor to its intended compressor is essential for both startup reliability and long-term motor health.

Why Use Genuine Danfoss Capacitors?

Danfoss capacitors are specifically engineered to work within a designated electrical system and are typically used in conjunction with a motor starter to improve the efficiency of the motor's startup phase. Substituting a non-OEM capacitor with mismatched capacitance or insufficient voltage tolerance can lead to hard starts, overheating, winding damage, and compressor failure — making genuine Danfoss components the prudent choice for technicians who need a repair to last. Browse the full selection of Run & Start Capacitors or explore the complete Danfoss catalog for compressors, accessories, and more.